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40 Hz reduced spacing
The above shows what happens at 40Hz if we reduce the spacing between the subwoofers to 4.3m.
We get better central coverage without 40Hz side lobes - adequate for long, narrow “shoe-box” venues but
wider coverage would be required for most arenas.
40Hz close coupled
Close coupling would give a wider coverage at that frequency but the spacing could still give coverage
irregularities at mid-bass frequencies due to the shorter wavelengths at higher frequencies.
The real world
Bass notes usually include harmonic components each with a different wavelength. Some will add giving an
amplitude peak whilst others will subtract giving an amplitude dip. This will give tonal changes with
listening position and emphasise particular notes and timbres.
In the following example, listeners over a wide central area will hear a warm bass note rich in harmonics
whereas those around the sides (in line with the subwoofers at 90º) will hear less of the fundamental but more
of the harmonics whose full wavelengths coincide with the subwoofer spacing.
All material © 2007. Martin Audio Ltd. Subject to change without notice.